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针对大涵道比涡扇发动机,建立基于最小二乘影响系数的低压转子现场动平衡方法,研制动平衡测试系统,搭建模型转子实验器,开展相关动力学特性计算与动平衡实验,并在真实发动机台架实验中验证其正确性、有效性与可靠性.结果表明:采用跟踪高脉冲、定比例方波的方法识别高齿信号,并对振动信号进行整周期截取、插值处理与多次平均,能够保证转速与相位测量的准确度与稳定性.1号支点对风扇不平衡较为敏感,5号支点对涡轮不平衡较为敏感,而2号支点对两者均敏感,但对风扇不平衡的敏感度更大.在保证动平衡效果的前提下,与三圆平衡法相比,低压转子现场动平衡技术能够提高操作便捷性,减少起停次数,降低时耗,具有一定的工程应用前景.
Aiming at large turbofan turbofan engine, a method of on-site dynamic balancing of low-pressure rotor based on the least-square influence coefficient was established. The system of dynamic balancing test was developed, and the model rotor experimental device was built. The relevant dynamics calculation and dynamic balancing experiment were carried out. The results show that the method of tracking high pulse and constant square wave is used to identify the signal of high tooth and the whole period of the vibration signal is intercepted, the interpolation process and the multiple mean , To ensure the accuracy and stability of the speed and phase measurements.First fulcrum on the fan is more sensitive to the imbalance, the 5th fulcrum is more sensitive to turbine imbalance, and the 2nd fulcrum for both sensitive, but the fan is not balanced Sensitivity is greater.Under the premise of ensuring the dynamic balance effect, compared with the three-circle balance method, the low-pressure rotor on-site dynamic balancing technology can improve the operation convenience, reduce the starting and stopping times, reduce the time consumption, and have certain engineering application prospect.